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Abstract

We experimentally demonstrate an extremely simple technique to achieve pulse advancements in optical fibers by using both spontaneous amplified and stimulated Brillouin scattering. It is shown that the group velocity of a light signal is all-optically controlled by its average power while it propagates through an optical fiber. The signal generates an intense back-propagating Stokes emission that causes a loss on the signal through depletion. This narrowband loss gives rise to a fast light propagation at the exact signal frequency. The Stokes emission self-adapts in real time to the Brillouin properties of the fiber and to a wide extent to the signal bandwidth.

Figures (7)

Fig. 1. Principle of the configuration to generate self-advanced fast light. The signal is powerful enough to generate a strong amplified spontaneous Stokes wave, which in turn depletes the signal wave. The depletion is assimilated to a narrowband loss spectrum.

Fig. 3. (a). measured optical powers of the Stokes waves and transmitted signals (b) linewidths of the generated Brillouin Stokes waves recorded in the ESA, by use of the delayed homo-heterodyne system.

Fig. 6. (a). Temporal traces of the data streams for a signal power below the critical power (solid line) and at maximum signal power realized in our setup (dashed line). (b) Signal advancement as a function of the average signal power, showing the logarithmic dependence over the Brillouin critical power at 10 dBm.

Fig. 7. (a). Measured spectra of the Stokes emission by the delayed self-homodyne technique, for different pulse widths at a constant normalized repetition rate. (b) Measured Stokes linewidth as a function of the measured signal bandwidth.